The EastAsianLunisolarCalendar.ToFourDigitYear(int) method uses the EastAsianLunisolarCalendar.TwoDigitYearMax property to determine the appropriate century.

EastAsianLunisolarCalendar.ToFourDigitYear(int) supports either a two-digit year or a four-digit year. Passing a two-digit year value (less than 100) causes the method to convert the value to a four-digit value according to the EastAsianLunisolarCalendar.TwoDigitYearMax value representing the appropriate century. If the application supplies a four-digit year value that is within the supported calendar range to EastAsianLunisolarCalendar.ToFourDigitYear(int), the method returns the actual input value. If the application supplies a four-digit value that is outside the supported calendar range, or if it supplies a negative value, the method throws an exception.